Abstract：
:We have previously demonstrated the potential usefulness of capillary columns coated with a high temperature polarizable phenylmethylsilicone liquid phase in plasma lipid profiling (Kuksis, A., J.J. Myher, and P. Sandra. 1990. J. Chromatogr. 500: 427-441). The present study reports improved operating conditions along with a practical application to the analysis of a series of human plasma samples in comparison to capillary gas-liquid chromatography on nonpolar columns. For this purpose the plasma lipids were dephosphorylated with phospholipase C and converted to the trimethylsilyl ethers. The molecular species of the plasma lipids were identified by comparing the relative retention times to reference standards. The species were quantitated using tridecanoylglycerol as internal standard. The recoveries of the lipid classes were determined by summing the molecular species within each carbon number and comparing the proportion of the carbon numbers obtained on polar and nonpolar columns. The relative recoveries varied with the lipid class and sample load and averaged as follows: FA C16, 78%; FA C18, 78%; FC, 99%; tridecanoylglycerol (TD), 100% (by definition); CER 34:1, 92%; DG C34, 103%; DG C36, 98%; CE C16, 73%; CE C18, 61%; TG C50, 93%; TG C52, 60%; TGC54, 32%. We conclude that high temperature polarizable capillary columns are suitable for qualitative and quantitative assessment of plasma lipids and provide more information per man-hour, instrument time, and unit cost than any other analytical method known.
journal_name
J Lipid Resjournal_title
Journal of lipid researchauthors
Kuksis A,Myher JJ,Geher Ksubject
Has Abstractpub_date
1993-06-01 00:00:00pages
1029-38issue
6eissn
0022-2275issn
1539-7262journal_volume
34pub_type
杂志文章abstract：:A synthetic analog of glucocerebroside, N-hexyl-O-glucosyl sphingosine, was found to inhibit the glucosidase in rat spleen that hydrolyzes glucocerebroside. At a concentration of 1 micro m, the analog inhibited the enzyme by 48%. The mode of action appeared to be competitive, probably aided by tight binding of the ami...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1973-03-01 00:00:00
abstract：:A modification of the semiautomated assay method of Antonis (1965. J. Lipid Res. 6:307-312) for free fatty acid is presented. Free fatty acids are extracted from serum or plasma into di-n-butyl ether-2-methoxyethanol; the extract is almost free from phospholipids. The acids are analyzed in a portion of extract by a co...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1978-02-01 00:00:00
abstract：:Incubation of 125I-labeled very low density lipoprotein (VLDL) with lipoprotein lipase-rich (postheparin) plasma obtained from intact or supradiaphragmatic rats resulted in the transfer of more than 80% of apoprotein C from VLDL to high density lipoprotein (HDL), whereas apoprotein B was associated with lipoprotein of...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1975-09-01 00:00:00
abstract：:Matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS) has been applied primarily to the analysis of glycosphingolipids separated from other complex mixtures by TLC, but it is difficult to obtain quantitative profiling of each glycosphingolipid among the different spots on TLC by MALDI-MS. Thus, the ...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.D800038-JLR200
更新日期：2008-12-01 00:00:00
abstract：:We have previously shown that expression of a human apoE cDNA in J774 macrophages enhances cholesterol efflux to HDL3. We have also shown that endogenous apoE expression produces a cell surface pool of apoE associated with proteoglycans. In this series of experiments, we first demonstrate the presence of a cell surfac...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1998-02-01 00:00:00
abstract：:The demand to study the cellular localization of specific lipids has led to recent advances in lipid probes and microscopy. Alkyne lipids bear a small, noninterfering tag and can be detected upon click reaction with an azide-coupled reporter. Fluorescent alkyne lipid imaging crucially depends on appropriate azide repo...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.D070565
更新日期：2016-10-01 00:00:00
abstract：:The primary structure of apolipoprotein A-II (apoA-II) isolated from the plasma high density lipoprotein (HDL) fraction of the inbred mouse strain BALB/c is described in this work. The complete 78 amino acid protein sequence was determined by proteolytic fragmentation, gas-phase microsequence analysis, and fast atom b...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1987-03-01 00:00:00
abstract：:The effect of electron transport chain redox status on activity of the mitochondrial Ca(2+)-independent phospholipase A2 (iPLA2) has been examined. When oxidizing NAD-linked substrates, the enzyme is not active unless deenergization occurs. Uncoupler, rotenone, antimycin A, and cyanide are equally effective at upregul...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.M043307
更新日期：2014-05-01 00:00:00
abstract：:Quantitative aspects of the binding of free fatty acid to human erythrocytes were studied by measuring the distribution of various amounts of [1-(14)C]lauric acid between washed human erythrocytes and defatted human plasma albumin. Incubations were done at 37 degrees C in an isotonic phosphate-buffered salt solution. ...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1972-07-01 00:00:00
abstract：:We describe a method for estimating the total activity of 3-hydroxy-3-methylglutaryl-CoA (HMG-CoA) reductase (EC 1.1.1.34) in the small intestine of rats. An homogenate of the whole small intestine is prepared rapidly and assayed directly to maximize the yield of enzyme and to minimize opportunity for uncontrolled cha...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1982-02-01 00:00:00
abstract：:The transfer or exchange of cholesteryl esters, triglycerides, and phospholipids between plasma very low (VLDL), low (LDL), and high (HDL) density lipoproteins is facilitated by specific lipid transfer proteins. The present report describes a method to separate donor and acceptor lipoprotein pools used in assays for l...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1982-05-01 00:00:00
abstract：:We have developed a simplified and improved high performance liquid chromatography (HPLC) method for the detection and quantitation of tissue lipid using a new laser light-scattering detector (Varex model ELSD II). This detector has a limit of sensitivity of 50 ng for neutral lipid and 200 ng for most phospholipids wi...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1990-11-01 00:00:00
abstract：:Clock genes respond to external stimuli and exhibit circadian rhythms. This study investigated the expression of clock genes in the small intestine and their contribution in the regulation of nutrient absorption by enterocytes. We examined expression of clock genes and macronutrient transport proteins in the small int...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.M900085-JLR200
更新日期：2009-09-01 00:00:00
abstract：:Visceral fat has been associated with multiple cardiovascular disease (CVD) risk factors. The aim of this study was to identify anthropometrical measures most closely associated with some well-known CVD risk factors. Because most Asians at risk have normal body mass index (BMI) according to Western standards, we studi...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.M300233-JLR200
更新日期：2003-12-01 00:00:00
abstract：:Lipoprotein (a) [Lp(a)] is a highly atherogenic lipid particle. Although earlier reports suggested that Lp(a) levels are mostly determined by genetic factors, several recent studies have revealed that Lp(a) induction is also caused by chronic inflammation. Therefore, we aimed to examine whether cytokine blockade by mo...
journal_title：Journal of lipid research
pub_type： 临床试验,杂志文章
doi：10.1194/jlr.P052209
更新日期：2015-05-01 00:00:00
abstract：:The effect of 26-hydroxycholesterol and other intermediates in bile acid synthesis on HMG-CoA reductase activity was studied in Chinese hamster ovary (CHO) cell culture. Incubation of CHO cells for 5 hr in 0.25 microM 26-hydroxycholesterol caused a 40% inhibition of HMG-CoA reductase activity. All other intermediates ...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1983-10-01 00:00:00
abstract：:Rates of conversion of alpha-linolenic acid (alpha-LNA, 18:3n-3) to docosahexaenoic acid (DHA, 22:6n-3) by the mammalian brain and the brain's ability to upregulate these rates during dietary deprivation of n-3 polyunsaturated fatty acids (PUFAs) are unknown. To answer these questions, we measured conversion coefficie...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.M600549-JLR200
更新日期：2007-05-01 00:00:00
abstract：:Origins of hyperlipidemia and cholestasis that occur during pregnancy were investigated by examining expression of key elements related to plasma and hepatic cholesterol metabolism during pregnancy, lactation, and post-lactation in the rat model. Among major findings were: during pregnancy, the activities of hepatic 3...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1998-11-01 00:00:00
abstract：:Elaborate control mechanisms of intracellular triacylglycerol (TAG) breakdown are critically involved in the maintenance of energy homeostasis. Hypoxia-inducible lipid droplet-associated protein (HILPDA)/hypoxia-inducible gene-2 (Hig-2) has been shown to affect intracellular TAG levels, yet, the underlying molecular m...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.M082388
更新日期：2018-03-01 00:00:00
abstract：:The objective of this study was to investigate the mobilization of individual fatty acids from human subcutaneous adipose tissue in vivo. Concentrations of individual non-esterified fatty acids were measured in arterialized plasma and in the venous drainage from subcutaneous abdominal adipose tissue in eight normal su...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1996-09-01 00:00:00
abstract：:Delta-5 and delta-6 desaturases (D5D and D6D) are key enzymes in endogenous synthesis of long-chain PUFAs. In this sample of healthy subjects (n = 310), genotypes of single nucleotide polymorphisms (SNPs) rs174537, rs174561, and rs3834458 in the FADS1-FADS2 gene cluster were strongly associated with proportions of LC-...
journal_title：Journal of lipid research
pub_type： 杂志文章,随机对照试验
doi：10.1194/jlr.P032276
更新日期：2013-02-01 00:00:00
abstract：:Absorption rates for many biologically important compounds are determined by the relative hydrophobicity of the jejunal microvillus membrane. An estimate of this parameter may be obtained by measuring the incremental change in free energy that occurs when a methylene group partitions into the bilayer form an external ...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1989-08-01 00:00:00
abstract：:Subnormal HDL-cholesterol (HDL-C) and apolipoprotein (apo)AI levels are characteristic of familial hypercholesterolemia (FH), reflecting perturbed intravascular metabolism with compositional anomalies in HDL particles, including apoE enrichment. Does LDL-apheresis, which reduces HDL-cholesterol, apoAI, and apoE by ads...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.P016816
更新日期：2011-12-01 00:00:00
abstract：:Palmitoleic acid is a minor monounsaturated fatty acid in the human diet and in blood plasma. Because macadamia oil is at least one potentially large source of palmitoleic acid, we tested its effect on plasma lipid levels against two other dietary fatty acids, oleic acid and palmitic acid. The dietary adjustments, thr...
journal_title：Journal of lipid research
pub_type： 临床试验,杂志文章,随机对照试验
doi：
更新日期：1994-04-01 00:00:00
abstract：:Protein farnesylation is a form of posttranslational modification that occurs in most, if not all, eukaryotic cells. Inhibitors of protein farnesyltransferase (PFTIs) have been developed as anticancer chemotherapeutic agents. Using the knowledge gained from the development of PFTIs for the treatment of cancer, researc...
journal_title：Journal of lipid research
pub_type： 杂志文章,评审
doi：10.1194/jlr.R500016-JLR200
更新日期：2006-02-01 00:00:00
abstract：:In recent years the short-chain fatty acid, 4-phenylbutyrate (PB), has emerged as a promising drug for various clinical conditions. In fact, PB has been Food and Drug Administration-approved for urea cycle disorders since 1996. PB is more potent and less toxic than its metabolite, phenylacetate (PA), and is not just a...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.M075317
更新日期：2017-05-01 00:00:00
abstract：:Familial hypobetalipoproteinemia, a syndrome associated with low plasma cholesterol levels, can be caused by apoB gene mutations. We identified a healthy 42-year-old man whose total plasma cholesterol level was 80 mg/dl. His plasma very low density lipoprotein (VLDL) contained a unique truncated apoB species, apoB-83,...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1992-04-01 00:00:00
abstract：:Endothelial dysfunction is a key step in atherosclerosis development. Our recent studies suggested that oxLDL-induced increase in endothelial stiffness plays a major role in dyslipidemia-induced endothelial dysfunction. In this study, we identify oxysterols, as the major component of oxLDL, responsible for the increas...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.M027102
更新日期：2012-07-01 00:00:00
abstract：:Stearoyl-CoA desaturase (SCD) catalyzes the rate-limiting step in the cellular synthesis of monounsaturated fatty acids, mainly oleate (18:1) and palmitoleate (16:1), which are the major monounsaturated fatty acids of membrane phospholipids, cholesteryl esters, waxes, and triglycerides. The mouse expresses three well-...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.m100433-jlr200
更新日期：2002-10-01 00:00:00
abstract：:Gangliosides and sulfatides (STs) are acidic glycosphingolipids (GSLs) that have one or more sialic acids or sulfate substituents, in addition to neutral sugars, attached to the C-1 hydroxyl group of the ceramide long chain base. TLC is a widely employed and convenient technique for separation and characterization of ...
journal_title：Journal of lipid research
pub_type： 杂志文章
doi：10.1194/jlr.D046128
更新日期：2014-04-01 00:00:00
